Border security

Nearly half of illegal border crossers weren't caught, report says

Immigration authorities caught just over half of the people who illegally entered the U.S. from Mexico last year, according to a report commissioned by the Department of Homeland Security that offers one of the most detailed assessments of border security ever compiled.

The report found that 54 percent of people who entered illegally between border crossings got caught in the 2015 fiscal year. That's much lower than the 81 percent success rate that Homeland Security cited publicly using a different counting method.

The 98-page report was completed in May, and Homeland Security officials have declined to release it, despite urging from some members of Congress. The Associated Press obtained a copy from a government official involved in border issues who acted on condition of anonymity because the department has not made the report public.

The department said Thursday that the report was "one building block provided by a research organization" toward developing more reliable measures of border security and that its methodology needed refinement.